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                    <h1>AVFoundation学习笔记六 读取相册内容ALAsset和PHAsset</h1>
                    
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                <h3 id="ALAsset-iOS9-0已废弃"><a href="#ALAsset-iOS9-0已废弃" class="headerlink" title="ALAsset (iOS9.0已废弃)"></a>ALAsset (iOS9.0已废弃)</h3><p>1、导入头文件<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">#import &lt;AssetsLibrary/AssetsLibrary.h&gt;</span><br></pre></td></tr></table></figure></p>
<p>2、具体流程<br><img src="http://cyrus_huang.gitee.io/blog/2018/11/05/AVFoundation学习笔记七-读取相册内容ALAsset和PHAsset/ALAsset.png" alt=""></p>
<p>3、相关代码<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">//1、创建ALAssetsLibrary</span><br><span class="line">    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];</span><br><span class="line">    //2、根据传入的type，在block中获得ALAssetsGroup，即相应的相册</span><br><span class="line">    [library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) &#123;</span><br><span class="line">        //3、相册设置筛选类型</span><br><span class="line">        [group setAssetsFilter:[ALAssetsFilter allVideos]];</span><br><span class="line">        //4、根据o筛选类型，遍历相册，在block回调中得到相应ALAsset</span><br><span class="line">        [group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:0] options:0 usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) &#123;</span><br><span class="line">            //5、对ALAsset进行相关操作</span><br><span class="line">            if (result) &#123;</span><br><span class="line">                ALAssetRepresentation *representation = [result defaultRepresentation];</span><br><span class="line">                NSURL *url = representation.url;</span><br><span class="line">                NSLog(@&quot;%@&quot;, url);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;];</span><br><span class="line"></span><br><span class="line">    &#125; failureBlock:^(NSError *error) &#123;</span><br><span class="line">        NSLog(@&quot;error: %@&quot;, error.localizedDescription);</span><br><span class="line">    &#125;];</span><br></pre></td></tr></table></figure></p>
<h3 id="PHAsset-ALAsset的代替）"><a href="#PHAsset-ALAsset的代替）" class="headerlink" title="PHAsset (ALAsset的代替）"></a>PHAsset (ALAsset的代替）</h3><p>1、导入头文件<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">#import &lt;Photos/Photos.h&gt;</span><br></pre></td></tr></table></figure></p>
<p>2、具体流程<br><img src="http://cyrus_huang.gitee.io/blog/2018/11/05/AVFoundation学习笔记七-读取相册内容ALAsset和PHAsset/PHAsset.png" alt=""></p>
<p>3、相关代码<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line">     * 1、PHAssetCollection（类似上面ALAssetsGroup相册的概念,有多个类，根据具体情况选择），调用fetch 开头的函数，得到一个PHFetchResult&lt;PHAssetCollection *&gt; *结果对象（相当于符合筛选的PHAssetCollection相册数组）</span><br><span class="line">     *   PHFetchResult:类似于C++的模板类，提供统一的collection类、PHAsset类筛选结果的遍历、获取方法</span><br><span class="line">     */</span><br><span class="line">    PHFetchResult *results = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:0];</span><br><span class="line">    //2、遍历results,对象为上面调用fetch函数的collection类</span><br><span class="line">    [results enumerateObjectsUsingBlock:^(PHAssetCollection *obj, NSUInteger idx, BOOL * _Nonnull stop) &#123;</span><br><span class="line">        //3、PHAsset调用fetch方法，获取相应PHAssetCollection相册内符合要求的PHAsset集合PHFetchResult</span><br><span class="line">        PHFetchResult *assets = [PHAsset fetchAssetsInAssetCollection:obj options:nil];</span><br><span class="line">        //4、遍历assets</span><br><span class="line">        [assets enumerateObjectsUsingBlock:^(PHAsset *obj, NSUInteger idx, BOOL * _Nonnull stop) &#123;</span><br><span class="line">            //根据asset的mediaType类型，调用相应的PHImageManager request方法（注意不同类型传入的options参数不同）</span><br><span class="line">            if (obj.mediaType == PHAssetMediaTypeImage) &#123;</span><br><span class="line">                [[PHImageManager defaultManager] requestImageForAsset:obj targetSize:CGSizeMake(obj.pixelWidth, obj.pixelHeight) contentMode:PHImageContentModeDefault options:[[PHImageRequestOptions alloc] init] resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) &#123;</span><br><span class="line">                    NSLog(@&quot;%@&quot;, [NSThread currentThread]);</span><br><span class="line">                    UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];</span><br><span class="line">                    imageView.image = result;</span><br><span class="line">                    [self.view addSubview:imageView];</span><br><span class="line">                &#125;];</span><br><span class="line">            &#125; else if (obj.mediaType == PHAssetMediaTypeVideo) &#123;</span><br><span class="line">                </span><br><span class="line">            &#125;</span><br><span class="line">        &#125;];</span><br><span class="line">    &#125;];</span><br></pre></td></tr></table></figure></p>


                
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